A GROUP of peers will today use ancient rights granted under Magna Carta to urge the Queen to block further European integration.Their petition, presented under Clause 61 of the ancient charter, asks the Queen to withhold Royal Assent from the Nice Treaty. It has the backing of 65 Euro-sceptic peers led by Lord Ashbourne and has been organised by Sanity (Subjects Against the Nice Treaty).Clause 61 of Magna Carta, signed by King John at Runnymede in June 1215, permits the "Sovereign's subjects to present a quorum of 25 barons with a petition which four of their number are then obliged to take to the Monarch who is obliged to accept it. She then has 40 days to respond." The "enforcement powers" granted by King John when he signed the Magna Carta were last used in 1688 at the start of the Glorious Revolution.